[SAC] [OSGeo] #2297: Drone (agent?) is failing to reach docker

[OSGeo]

#2297: Drone (agent?) is failing to reach docker
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 Reporter:  strk           |      Owner:  robe
     Type:  task           |     Status:  assigned
 Priority:  normal         |  Milestone:  Sysadmin Contract 2019-I
Component:  Systems Admin  |   Keywords:
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 See https://dronie.osgeo.org/postgis/postgis/240

 Error message is:
 pg-9.5: Cannot connect to the Docker daemon at
 unix:///var/run/docker.sock. Is the docker daemon running?

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2297>
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